My mom is planning on taking DD2 and DD4 for a day at SeaWorld. We are going to have our double stroller but I'm wondering if it would be easier for her to just rent a single. How much walking is there? DD4 will be 2 months shy of 5 but they will be at SeaWorld after 4 days at DW (though she'll be in the stroller there). Ideally I'm going to try to squeeze our umbrella stroller into our van (so she has a stroller for the walk to and from the parking lot) but van space is super limited.